Removing elements from an Array

I have two arrays:

   A = [0, 1]; and B = [0, 1, 3, 1, 4, 5, 6];

I want to compare the first element of A to the first 3 elements of B and the second element of A to the next 4 elements of B. If the elements of A are equal I delete it from B. So in simple:

   if (A(1) == B(1:3))
   delete A(1) from B

Similarly

   if (A(2) == B(4:7))
   delete A(2) from B

Is there any way I can do this without having to enter the indices in a hard coded manner?

So in the end B should have the following elements:

      B = [1, 3, 4, 5, 6];

[Jan]

The question is not clear. What if A(1) is 1? Then 1 is found in the first block of B. Should B be set to

[0, 3, 1, 4, 5, 6];

afterwards, or to

[0, 3, 4, 5, 6];

Or should the elements of B removed at the end only after the matching elements have been found?

So what are the wanted outputs for:

A  = [0, 1]
B1 = [0, 1, 2, 0, 1, 2]
B2 = [0, 0, 0, 1, 2, 3]
B3 = [1, 1, 2, 1, 1, 2]

?

[CharlesB]

Sorry for not being clear the first array A will always have elements in the following sequential order 0, 1, 2 ..... The second Array B will always have an element of B so B can be [0,1,2, 0,1, 3, 1,2,5] and B has to become [1,2, 0,3, 1,5] as I removed the elements of B after comparing them as I explained above. The wanted outputs for B1 = [1,2, 0, 2]; For B2 = [2,3]; For B3 = [1,1,2, 2]. In this case I compared the elements of A for every 3 elements of B. In the above example I compared A(1) to the first 3 elements of B and A(2) to the next 4 elements of B. The comparison between 1 element of A to the elements of B can vary. What does not change is the sequential elements of A they will always b 0, 1, 2, 3,... Please stick to my question as it will get even more confusing.

[Jan]

Is this the same problem as in your thread https://www.mathworks.com/matlabcentral/answers/406790-removing-elements-from-an-array-based-on-their-position-for-every-3-elements? Then it is solved there.

Answer 1

[KSSV]

   A = [0, 1]; 
   B = [0, 1, 3, 1, 4, 5, 6];
   C{1} = B(1:3) ;
   C{2} = B(4:end) ;
   for i = 1:2
       C{i}(C{i}==A(i))=[] ;
   end
   cell2mat(C)